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You will probably have to add that anyway, if you want to be able to sell the house. Lack of sprinkler system backflow protection is one of the things they can catch at a home inspection. Some of the devices can cost $300

I have exactly the same valve, I think. Went to local Ewing's here in Chandler, AZ and they sold me two R1359s. I was having trouble with the valve turning on (solenoids are OK). After replacing the diaphragm, everything worked OK for a while, but then I noticed the sprinklers were weeping, so I cranked off the screws and checked for debris, etc. All looked good but after re-assembling the weeping was worse. I swapped out the new diaphagm with the one that had never been used, and the sprinklers are still not turning off all the way, major weeping problem. It seems as if the diaphragm is just a hair too large for the receiver piece in the valve. Could that be? The valve also groans when it's on.

Just as an addendum, guy, the HR-1 valve is notorious for cracks in the valve seat.
Even with a diaphragm replacement, the valve will often continue weeping. Good sign of a crack. They're hard to see until the valve is out of the ground and can be turned in the light for better observation.

The Irrigation Specialist Mfg' Az.
Please check my website and you'll find what I do and the unique tools I make and market.
Real timesavers, especially the Suck-Tube and Krik-It. http://www.tismaz.com

No one wants to vouch for the quality of Home Depot inventory. I have seen light-green-plastic versions of good Irritrol valves, but with their Lawn Genie name on them. This could change, and there are crummy valves to be had in that same color, made by imitators.